Patients with caudal fractures and dislocations often dislike sitting or even refuse to sit due to tail pain and would like to rest on their side in bed. Caudal fractures and dislocations are significantly more common than sacral fractures, especially in women, and are commonly seen in life and sports accidents. Most of these fractures are caused by the direct impact of the hip on the ground after a fall by the reaction force of a protruding object. Due to the contraction of the coccygeal muscle and the direction of the external force mostly from the posterior and inferior, the distal end of the fracture is easily displaced forward and upward, so that the coccyx is mostly shown as a forward-bending hook on the X-ray film. However, the anatomical variation of the caudal vertebrae is large, and the sacrococcygeal angle formed by the sacral and caudal bones can vary greatly from an upright position to more than 90°. So to prevent caudal pain and refuse to sit in the first place, it is necessary to avoid falling down. The treatment methods are as follows: 1.Surgical treatment Mainly caudal osteotomy. Selection of surgical cases: Mainly cases with long-term pain after tailbone injury and cannot be relieved. The specific cause is very unclear, probably due to scar tissue compression of the caudal nerve. Preoperatively, sacral tumor, inflammation and lumbar disc herniation should be excluded. Preoperative preparation: clean enema 1~2 days before surgery, empty stool in the morning of surgery, and take oral antibiotics to prevent gastrointestinal infection. 2, non-operative treatment Acute phase: bed rest for 3-5 days and then gradually get out of bed and move around, with inflatable or sponge cushion when sitting. In case of fracture displacement, reposition the fracture by anal finger diagnosis under local anesthesia (by sliding up and down and applying pressure to make the distal fracture return to its original position), and then repeat it once after 3 days. Due to the pulling effect of the perianal levator muscle, it is often difficult to obtain the ideal reset. Chronic phase: Physiotherapy and sitz baths can be used, and attention should be paid to not putting more local pressure. In severe cases, sacral canal closure therapy is feasible, once a week, 3 to 4 times as a course of treatment. For those with stubborn symptoms, caudal osteotomy can be performed as appropriate.